Post-vulcanizing bonding

Chem. Descrip. Disp. of polymers, org. resins, and fillers in org. soivs. Uses Cover coat and post vulcanization bonding agent adhesive for bonding rubbers to metal and other substrates during vulcanization and post-vulcanization... 

Post-vulcanization bonding—Conventional adhesive bonding of previously vulcanized elastomeric adherends. 

Rubber to metal bonding - basic techniques P LEWIS In- and post-vulcanization bonding... 

Table 7.15 Comparison of Vulcanization and Post-Vulcanization Bonding ...

Spearman BP, Hutchinson JD. Post vulcanization bonding techniques. Adhes Age. 1974 7 (4) 30-33. 

Uses Post vulcanization stabilizer for sulfur cures of NR, IR, SBR, and NBR used in tire treads, sidewalls, and general industrial prods, incl. belting and inj. molded goods bonding promoter for rubber-based steel adhesion Trade Name Synonyms Duralink HTS [Flexsys http //www.fiexsys.com, Harwick Std. Distrib. http //WWW. harwickstandard. com]... 

With the advent of the energy absorbing bumper systems on automobiles, a need has developed for bonding and testing post cure bonded and vulcanized in place rubber-to-metal bonds. 

A study of vulcanized in-place bonds was more limited in scope and may need further work to confirm the results obtained thus far (Table 6). There was better agreement of the results of duplicate samples than with the post cure bonded samples. 

Percent deviation was 2.0 to 6.1 percent and the average deviation of all the samples was 3.7 percent. One result of this evaluation was the discovery that the force required to cause rubber or adhesive failure in vulcanized in-place bonds was up to 56.2 percent higher than the force required for post cure bonds using the same adhesive system. Testing also revealed that the partial failure of the adhesive system was more likely to occur with the vulcanized in-place bonds. The best primer was found to be primer B and the best cover adhesive was adhesive F (Table 7). Primer A... 

In summary, we have presented a method for the dynamic shear testing of post cure bonded and vulcanized in-place rubber-to-metal bonds at high speeds. This method is applicable for the testing of elastomeric energy absorbing bumper systems on automobiles in the five miles per hour range. This method has the capability of reproducible results with greater consistency than previous methods. 

Almost all types of elastomers can be bonded to a large variety of substrates by the process known as vulcanization. The strength of similar bonds by adhesive bonding, or post-vulcanization (PV) bonding, as it is also called, was originally believed to be much weaker and less resistant to environmental exposure. Published work has demonstrated that this is not true, with some exceptions. The advantages of PV bonding are " ... 

Covers for the battery designs in Figures 1 and 2 are typically molded from materials identical to that of the respective case, and vent plugs are frequentiy made of molded polypropylene. Other combinations are possible, eg, containers molded of polyethylene or polypropylene may be mated with covers of high impact mbber for use in industrial batteries. After the cover is fitted over the terminal post, it is sealed onto the case. The cover is heat bonded to the case, if it is plastic it is sealed with an epoxy resin or other adhesive, if it is vulcanized mbber. Vent caps are usually inserted into the cover s acid fiU holes to faciHtate water addition and safety vent gasses, except for nonaccessible maintenance-free or recombinant batteries. In nonaccessible batteries, the vent is fabricated as part of the cover. 

Double-Bond Cure Sites. The effectiveness of this kind of reactive site is obvious. It allows vulcanization with conventional organic accelerators and sulfur-based curing systems, besides vulcanization by peroxides. Fast and controllable vulcanizations are expected so double-bond cure sites represent a chance to avoid post-curing. Furthermore, blending with other diene elastomers, such as nitrile mbber [9003-18-3] is gready faciUtated. 

---